Additionally, factors involved in signaling pathways, such as ‘JAK–STAT’, ‘tyrosine kinase activity’, ‘integrin binding’, or ‘IGF‐receptor’ were specifically secreted from seminoma cells, choriocarcinoma cells, endothelial cells, and fibroblasts, respectively (Figs S2A,C and S3B,D). Here, SOAT1 is linked to seminoma.